(1)将天放在水桌面上，游码移到标尺左端发现指针静止时如图15甲所示，应将衡螺母向」调，使横梁衡。(2)先测出烧杯和盐水的总质量为123.2g。然后将烧杯中的盐水倒人量简中一部分，如图15乙所示，量筒读数时做法正确的是(选填“a”“b”或“c”),倒入量筒中的盐水体(3)把烧杯和剩余盐水放在天左盘中称量，当横梁衡时，所用砝码和游码在标尺上的位置积为mLe如图15丙所示，则烧杯和剩余盐水的总质量为S42g，盐水的密度为kgm3。(4)小明在做完一次实验后不小心摔坏了量筒，在缺少量筒的情况下请你帮小明设计实验方案测出盐水密度。①用天称出空杯子的质量m;②往杯中倒人适量的水，在水面处对杯子作标记，用天称出杯和水的总质量m,；③将水倒掉并擦干杯子，再向杯中倒入盐水至标记处，用天称出盐水和杯的总质量m,。根据以上测量写出盐水密度表达式：P*（用m,、m、m、P*表示)。(2分)五、综合应用题（本题共2小题，第20题8分，第21题9分，共17分）20.如图16所示，这是一辆5G无人环卫车，质量为400kg,车与地面接触的总面积为200cm,若它以4ms的速度在水路面上沿直线匀速行驶5mi,且所受阻力为车重的二。求此过程中：10(g取10N/kg)(1)环卫车是通过接收5G信号的；当环卫车匀速直线行驶时，相对于旁边的树木，环卫车是的，环卫车的动能(选填“变大”“变小”或“不变”)。(2)环卫车静止时对地面的压强。(3)牵引力做的功。图1621交警使用的某型酒精测试仪的工作原理如图17所示，电源电压恒为9V,传感器R,是气敏电阻，其阻值随酒精气体的浓度的变化而变化。酒精浓度通过电流表示数来反应，当酒精气体浓度增大时，电流表的示数变大。为精准使用，测试仪使用前要通过调零旋钮（即滑动变阻器凡，的滑片)进行调零，即当酒精气体浓度为0时，电压表示数为5V,电流表的示数为0.1A。调零结束后保持R电阻不变，试问：(选填“增大”“减小”或“不(1)当酒精气体的浓度增大时，电阻R,的阻值变”)。(2)酒精气体浓度为0时，滑动变阻器R,的阻值为多少？（3)某驾驶员对着酒精测试仪吹气，若电流表示数达到0.24，表明该驾驶员酒驾，则此时电压(4)在不改变实验装置和电表量程的情况下，要提高电流表能反应酒精浓度的最大值，请写出表的示数是多少？一种简便可行的方便。图17九年级物理第4页（共4页）

(3)若滤渣中含有三种金属，则滤液中含有的金属离子是什么？24.(3分)为了除去粗盐中CaCl,MgC、NaSO,等可溶性杂质，需进行如下操作：①溶解；②依次加入过量的BaCl2、NaOH、Na,CO,溶液；③过滤；④加人适量盐酸；⑤蒸发、结晶。[提示：Mg(OH)2、BaSO,、BaCO,难溶于水；微溶物不形成沉淀；Na,CO,溶液呈碱性](1)加入Na2CO溶液的目的是什么？(2)最后制得氯化钠的质量大于粗盐中氯化钠的质量，写出一个可使氯化钠质量增加的化学方程式。(3)请设计实验方案证明操作③所得溶液中含有NaOH。(写出实验步骤和现象)四、综合应用题（共10分）25.化学是以实验为基础的科学，实验是科学探究的重要手段。歌世下手离饱和NaHCO,溶液(1)下列仪器中不能用于加热的是(填字母)。b.量筒c试管d.蒸发皿a烧杯(2)实验室利用A装置制取氧气的化学方程式为。若用D装置收集氧气，气体应从(选填“c”或“d”)端进人。,(3)B装置可以随时控制反应停止的原理是;简述实验室检验二氧化碳的方法：;制得的二氧化碳中常含有少量的氯化氢气体与水蒸气，若要制取一瓶较为纯净、干燥的CO2,所选用装置的导管接口的正确连接顺序为a接接接b。(4)为探究足量NaOH溶液吸收CO2后溶液中溶质的成分，某同学设计如下方案：取少量溶液，加入足量Ca(OH)2溶液，反应后静置，取上层清液滴加酚酞溶液；若溶液变红，溶质为NazCO,和NaOH。请指出该方案中的错误并加以改正。(5)鸡蛋壳的主要成分是碳酸钙。为了测定鸡蛋壳中碳酸钙的质量分数，小刚同学收集了6,25g干燥的鸡蛋壳与足量稀盐酸在烧杯中反应（杂质不与盐酸反应），测得反应后烧杯中物质的总质量减少了2.2g。请计算小刚同学收集的鸡蛋壳中碳酸钙的质量分数。九年级化学第4页（共4页）

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或x=4·经验证当x=4即C=4时，ADT最天，且ADm=3三、解答题：共70分。解答应写出文字说明、证明过程或演算步骤.17.解：(1)设等差数列{a}公差为d,S4=S,a,=0,8+4d=0,d=-2,S.=8n-n-(-2）=9n-n2.2回A-号=4，么==8+10=2.数别63公比为5六6=4（匀=2-18.解：(0：k=100×(20×20-20×40y2252.778

本小题满分12分)ab0的高心率为桶圆C的一个焦点与C上的减值是2-√2.1)求椭圆C的方程；2)若月，B是C的上，下两个顶点，过点P0.2)的直线1交椭圆C于D,E两点（异于B,B),证明：直线BE,BD的交点在一条定直线上.(本小题满分12分)已知函数A（)=2sin上一cosx,g()=2r+ar(a∈R0,(1)讨论p(x)的单调性；X2-(2)当a=1时，讨论函数f(x)=h(x)一p(x)极值点的个数.tr.-aX=2J-a上)选考题：共10分。请考生在第22、23两题中任选一题作答。如果多做，则按所做的第一题计分。(本小题满分10分)选修4-4：坐标系与参数方程x=t,在直角坐标系xOy中，直线l的参数方程为(t为参数)，以O为极点，x轴正半轴为极y=-1+22轴建立极坐标系，圆C的极坐标方程为p=22cos(+牙)，直线1和圆C交于A,B两点，P是圆C上不同于A,B的任意一点.(1)求圆心C的极坐标；(2)求△PAB面积的最大值..(本小题满分10分)选修4-5：不等式选讲已知m>0,>0是十是=4正明，0①mm≥(2)(m立十n)(m+n是)≥2.

a do to avoid using more plastic?(D)A.She chooses fewer new clothes.请阅读下面短文，根据语篇内容，在方框内的缩写文章中，填入与短文意思最符合的单词，并将答案B.She uses fewer electronic products.写在答题卡相应的位置上。每空一词。C.She buys the biggest packets of potato chips.A group of students from different cultural backgrounds organized a program called "The Future of the42.What will more people do after visiting the family's website?Silk Road".They went to many Chinese cities with ancient cultures.Once they went to Weinan,ShaanxiA.Stop eating chips.province where they experienced performing arts.B.Throw away their plastic wasteOne of the art forms they experienced was Huayin Laogiang,a folk opera()style listed as an intangi-C.Take action to protect the environment.ble cultural heritage(非物质文化遗产）.Because of its powerful pronunciation,it's described as the tradi--43.What's the best title for this passage?tional Chinese rock.Peter,an international student,said,"It's interesting to see how the artists perform withA.How to Change Family Habitsenergy and love.And they want to protect their culture."B.How to Protect the EnvironmentAt Tongguan Museum,students experienced another style of Laogiang,called the Yellow River Laogiang.C.How to Develop Family Traditions(C)This is performed by children.Their director,Yao Miaorong,said that they mixed Laogiang with local culture请阅读下面短文，根据语篇内容，从方框内所给的选项中选出能填入空白处的最佳选项，使短文意and art to keep children interested."Our goal is to encourage children and help them to learn about their思通顺，并在答题卡上将该项涂黑。选项中有一项为多余项。hometown,and devote themselves to its development when they grow up."Are you starting a new school or class this year?44 This experience can build students'social skillsComparing the Laogiang performed by artists and children,Peter said he could see how the young passedand help them build confidence.down the culture."I think more and more young people will truly take part in cultural activities,"Peter said.Change is a normal part of life.But people may feel scared to face it.That's because it's hard for peopleDuring the journey,some students exchanged their cultural knowledge and improved their language skills.to prepare for every change that'll happen.45 Getting skilled in dealing with changes will help you.Yan Kelin,a local student,said,"I realize English is a tool.In order to introduce our culture to internationalEven if you're excited about starting a new school,you may still feel anxious(),sad or worried.visitors successfully,I need to improve my English skills and have a deeper understanding of my hometown inThese are normal feelings.46 This will help you feel better about changes.If you're sad,it's a signall ways,such as its culture and history.you've had a good experience that you're sorry to leave behind.If you're not sad,then you're probably readyfor a new start.Then try to express them in a way that feels good to you after understanding these normal feel-Students with different cultural backgrounds joined "The Future of the Silk Road"pro-ings.This may be through talking,art,music or something else.47 Think about the good results thatgram.They chose to visit cities in China with 49 cultures.They experienced Huayin Lao-have come from the change-it may surprise you.giang which has powerful pronunciation in Weinan,Shaanxi province.Peter said artists wanted48 Consider a new school as a good exercise.Try to know your feelings as they develop over the nextto protect their own 50.Students also enjoyed the Yellow River Laogiang performed byfew weeks,and then compare them with what you have expected.Next time when the big change comes,you'llknow how to face it even better.children.Director Yao said what he had done can 51 and help children to know abouttheir hometown and make a difference to its development in the future.In the activity,studentsA.Think about changes you've experienced before.exchanged their cultural knowledge and improved their language skills.Peter thinks the youngB.Try talking about these feelings with your friends.C.However,you can learn how to deal with the change.will take part in the activities to 52 down the culture.In Yan Kelin's opinion,to introduceD.This is something that most students have experienced.their culture to international visitors 53,he should improve his English skills.He alsoE.Change is a chance to learn to deal with the challenges.needs to have a deeper understanding of the culture and history of his hometown.F.Finally,try to see both sides of the change and list them.英语二第7页（共12页）英语二第8页（共12页）

a do to avoid using more plastic?(D)A.She chooses fewer new clothes.请阅读下面短文，根据语篇内容，在方框内的缩写文章中，填入与短文意思最符合的单词，并将答案B.She uses fewer electronic products.写在答题卡相应的位置上。每空一词。C.She buys the biggest packets of potato chips.A group of students from different cultural backgrounds organized a program called "The Future of the42.What will more people do after visiting the family's website?Silk Road".They went to many Chinese cities with ancient cultures.Once they went to Weinan,ShaanxiA.Stop eating chips.province where they experienced performing arts.B.Throw away their plastic wasteOne of the art forms they experienced was Huayin Laogiang,a folk opera()style listed as an intangi-C.Take action to protect the environment.ble cultural heritage(非物质文化遗产）.Because of its powerful pronunciation,it's described as the tradi--43.What's the best title for this passage?tional Chinese rock.Peter,an international student,said,"It's interesting to see how the artists perform withA.How to Change Family Habitsenergy and love.And they want to protect their culture."B.How to Protect the EnvironmentAt Tongguan Museum,students experienced another style of Laogiang,called the Yellow River Laogiang.C.How to Develop Family Traditions(C)This is performed by children.Their director,Yao Miaorong,said that they mixed Laogiang with local culture请阅读下面短文，根据语篇内容，从方框内所给的选项中选出能填入空白处的最佳选项，使短文意and art to keep children interested."Our goal is to encourage children and help them to learn about their思通顺，并在答题卡上将该项涂黑。选项中有一项为多余项。hometown,and devote themselves to its development when they grow up."Are you starting a new school or class this year?44 This experience can build students'social skillsComparing the Laogiang performed by artists and children,Peter said he could see how the young passedand help them build confidence.down the culture."I think more and more young people will truly take part in cultural activities,"Peter said.Change is a normal part of life.But people may feel scared to face it.That's because it's hard for peopleDuring the journey,some students exchanged their cultural knowledge and improved their language skills.to prepare for every change that'll happen.45 Getting skilled in dealing with changes will help you.Yan Kelin,a local student,said,"I realize English is a tool.In order to introduce our culture to internationalEven if you're excited about starting a new school,you may still feel anxious(),sad or worried.visitors successfully,I need to improve my English skills and have a deeper understanding of my hometown inThese are normal feelings.46 This will help you feel better about changes.If you're sad,it's a signall ways,such as its culture and history.you've had a good experience that you're sorry to leave behind.If you're not sad,then you're probably readyfor a new start.Then try to express them in a way that feels good to you after understanding these normal feel-Students with different cultural backgrounds joined "The Future of the Silk Road"pro-ings.This may be through talking,art,music or something else.47 Think about the good results thatgram.They chose to visit cities in China with 49 cultures.They experienced Huayin Lao-have come from the change-it may surprise you.giang which has powerful pronunciation in Weinan,Shaanxi province.Peter said artists wanted48 Consider a new school as a good exercise.Try to know your feelings as they develop over the nextto protect their own 50.Students also enjoyed the Yellow River Laogiang performed byfew weeks,and then compare them with what you have expected.Next time when the big change comes,you'llknow how to face it even better.children.Director Yao said what he had done can 51 and help children to know abouttheir hometown and make a difference to its development in the future.In the activity,studentsA.Think about changes you've experienced before.exchanged their cultural knowledge and improved their language skills.Peter thinks the youngB.Try talking about these feelings with your friends.C.However,you can learn how to deal with the change.will take part in the activities to 52 down the culture.In Yan Kelin's opinion,to introduceD.This is something that most students have experienced.their culture to international visitors 53,he should improve his English skills.He alsoE.Change is a chance to learn to deal with the challenges.needs to have a deeper understanding of the culture and history of his hometown.F.Finally,try to see both sides of the change and list them.英语二第7页（共12页）英语二第8页（共12页）

【详解】根据三角形面积公式，S.=2AB=1,又根据余弦定理：BC2=AB2+AC2-2·AB·MC.cos.∠BAC-1+4-2x1x2x分3BC-,根据正弦定理得：ABBCsin∠ACB sin ZBAC'15=2sin∠ACB248in∠ACB=,∠ACB=30°或1502三角形内角和为180°，∠BAC=60°排除∠ACB=150°∴.∠ACB=30°故选：A8.在锐角△ABC中，BC=2,sinB+sinC=3sinM,点D是BC边的中点，则AD的长度的取值范围是()A.[8,9)B.[25,3c[别D.【详解】设角A,B,C所对的边分别为a,b,c,则a=BC=2,,sinB+sinC=3sinA,由正弦定理可得b+c=3a=6,即c=6-b,[62+c2-a2=b2+(6-b)2-4>0若△ABC为锐角三角形，则+-46-b->0.解利6c号a2+b2-c2=4+b2-(6-b)2>0又：点D是BC边的中点，则而=西+AC),可得8-带+-带+2器肥，肥)-6+e+2s心e+2”）2w+e-司2w+6-y月=b2-6b+17=(b-3+8,

全面汇聚发展合力：(3分)②党勇于自我革命，不断加强自身建设，推动全面从严治党，坚持科学执政、民主执政，准确把握经济发展规律增强领导经济工作的能力，为做好2024年经济工作指明方向：(3分)③在我国的政党制度中，共产党是执政党，各民主党派是参政党，共产党和各民主党派通力合作，共同为做好2024年经济工作作出贡献：(3分)④坚持全过程人民民主，通过政党协商这种制度化、程序化的安排集中各种意见和建议，推动经济决策科学化、民主化。(3分)(若从其他角度回答，言之有理，可酌情给分，但不可超过本题的满分。)18.(1)①基层群众自治制度是我国的基本政治制度，居民委员会是基层群众性自治组织。在居委会主任的组织下，大家的事大家商量着办，是人民当家作主直接行使民主权利的生动实践。(4分)②社会主义协商民主是中国特色社会主义民主政治的独特优势，居委会主任在中国城市的基层实践着协商民主，保证了人民在日常政治生活中的持续参与，有利于扩大社会共识、减少社会矛盾。(4分)③在居委会主任的协调下，民生议事会等做法实现了居民大事居民共同决策，做到了集民智，聚民心，透明公开。充分实现居民自我管理、自我服务，当家作主。（或从民主协商、民主决策、民主监督、民主管理角度回答)(4分)④居委会主任所代表的基层治理模式，是推进国家治理体系现代化、提高国家治理能力的重要内容。(4分)(本题任写出其中的三点即可给满分，.若从其他角度回答，言之有理，可酌情给分，但不可超过本愿的满分。)(2)①了解社区需求：通过走访、调查等方式，了解社区居民的需求和问题，为制定工作计划提供依据。②建立良好的沟通机制：与社区居民、相关部门、社会组织等建立良好的沟通机制，及时了解社区动态，解决问题。(此题为开放题，答案不唯一，解答本题可从民主决策、民主协商、民主管理、民主监督等角度思考，每条2分，其他答案只要合理即可给分。)19.①坚持党的领导，顺应时代发展要求，与新时代中国特色社会主义伟大进程相适应，对立法作出与时俱进的修改，将实践经验用立法进行确认和保护，立良善之法，立管用之法。(4分)②全国人大常委会依法行使职权，发扬全过程人民民主，民主立法。(4分)③合理设定地方立法协同、权力与责任等内容，遵循立法工作规律和法律体系的内在逻辑，实现科学立法。(4分)(若从其他角度回答，言之有理，可的情给分，但不可超过本题的满分。)20.①人能够能动地认识世界，意识活动具有目的性、自觉选择性和主动创造性。面对碳排放造成的一系列影响人类生存与发展的问题，我国提出“碳达峰”和“碳中和”目标，我国坚持新发展理念，低碳减排，走实“碳达峰”和“碳中和”的目标达成之路(4分)②人能够能动地改造世界，通过实践把观念的东西变成现实的东西。结合各地各部门实际情况，实现差别化和包容式低碳转型，坚持改革创新，引导公众践行绿色低碳生活方式。积极应对气候变化的战略定力，继续做全球生态文明建设的重要贡献者。(4分)③尊重客观规律是正确发挥主观能动性的前提条件。针对碳排放导致全球变暖，极端天气事件增加，对生命系统形成威胁，我国遵循自然规律的基础上提出“碳达峰”和“碳中和”目标，并努力采取有效措施去实现。(4分)(若从其他角度回答，言之有理，可酌情给分，但不可超过本题的满分。)答案第4页，共4页